JP2021090400A - Cover device and implement - Google Patents

Abstract

To provide an agriculture implement capable of improving safety properties.SOLUTION: An agriculture implement 1 comprises: work means 5; power transmission means 11 for transmitting power for driving the work means 5; and a cover unit 12 for covering a bending part of the power transmission means 11. The cover unit 12 comprises: an external cover body 71; and an internal cover body 72 which is rotatably provided in the external cover body 71. The internal cover body 72 rotates so as to follow bending motion of the bending part of a rotary shaft body of the power transmission means 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cover device and a working machine capable of improving safety.

Conventionally, for example, an agricultural work machine (grass mower) which is an offset work machine described in Patent Document 1 is known.

In this conventional agricultural work machine, a mounting portion to be mounted on a tractor, which is a traveling vehicle, a working portion that is offsetly connected to the mounting portion to perform mowing work, and the mounting portion and the working unit are powered by the tractor. It is equipped with a power transmission member that transmits between them. Further, although not shown in the figure of Patent Document 1, in order to ensure safety, it is usual to provide a covering means for covering the power transmission member or the like.

Japanese Unexamined Patent Publication No. 2012-39941

Further, in a work machine provided with a power transmission means for transmitting power, improvement in safety is required.

The present invention has been made in view of such a point, and an object of the present invention is to provide a cover device and a working machine capable of improving safety.

The cover device according to claim 1 is a cover device that covers a bent portion of a power transmission means used in a work machine, and is rotatable with respect to an outer cover body that covers the bent portion and the outer cover body. , An inner cover body that covers the bent portion is provided.

The cover device according to claim 2 is the cover device according to claim 1, wherein the inner cover body rotates so as to follow the bending operation of the bending portion of the power transmission means.

The cover device according to claim 3 is the cover device according to claim 1 or 2, wherein the inner cover body has a contact portion that comes into contact with the power transmission means.

The cover device according to claim 4 includes, in the cover device according to any one of claims 1 to 3, a stopper means for restricting the rotation of the inner cover body with respect to the outer cover body.

The cover device according to claim 5 is the cover device according to any one of claims 1 to 4, wherein the bent portion of the power transmission means has two spiders, and the inner cover body is between the two spiders. It rotates around the position of the center axis of rotation.

The work machine according to claim 6, wherein the work means, a power transmission means for transmitting power for driving the work means, and any one of claims 1 to 5 covering a bent portion of the power transmission means. It is equipped with a cover device.

According to the present invention, safety can be improved.

It is a side view of the agricultural work machine which concerns on one Embodiment of this invention. Same as above It is a plan view when the agricultural work machine is stored. Same as above It is a plan view of the agricultural work machine at the time of offset. Same as above It is a plan view of a main part of an agricultural work machine (a state in which a bent part is bent). Same as above It is a plan view of a main part of an agricultural work machine (a state in which a bent part is not bent). It is a perspective view of the cover device provided in the same farm work machine. It is a perspective view of the outer cover body of the cover device of the same as above. It is a perspective view of the inner cover body of the cover device of the same as above. It is a perspective view of the modification of the inner cover body of the cover device of the same as above.

An embodiment of the present invention will be described with reference to FIGS. 1 to 8.

In FIGS. 1 to 3, reference numeral 1 denotes a farm work machine which is a work machine, and the farm work machine 1 is mounted on the rear part of a tractor (not shown) which is a traveling vehicle, for example, and is forward in the traveling direction due to the traveling of the tractor. It is a mower (offset work machine) that performs mowing work, which is agricultural work, while moving to.

The agricultural work machine 1 has a mounting portion 2 detachably attached to a three-point link at the rear of the tractor, a working portion (offset working portion) 3 having a working means 5 for performing grass cutting work, which is agricultural work, and these mounting portions 2. It is provided with a connecting portion 4 for connecting the working portion 3 and the working portion 3.

Further, the agricultural work machine 1 rotates the offset cylinder 7, which is the first driving means for moving the work unit 3 in the left-right direction (horizontal direction), and the work unit 3 in the vertical direction around the support shaft 9 in the front-rear direction. It is provided with a tilt cylinder 8 which is a second driving means. Therefore, the working unit 3 can be switched between a retracted state located behind the tractor and an offset state located offset laterally with respect to the tractor, and can be changed to a horizontal posture and an inclined posture. ..

Further, the agricultural work machine 1 is a bendable longitudinal power transmission means (wide-angle joint) 11 that transmits power (rotational power) from the tractor side for rotationally driving the work means 5 of the work unit 3. And a cover device (wide-angle joint cover) 12 provided at the center of the mounting portion 2 in the left-right direction and covering the bent portion (bent portion of at least one of the plurality of bent portions) 46 on the front side of the power transmission means 11. I have.

The mounting portion 2 has a hitch frame 16 which is a frame body longitudinally longitudinal in the left-right direction, and the hitch frame 16 has a three-point connecting portion 17 which is detachably mounted (connected) to a three-point link at the rear of the tractor. It is provided. An input shaft holding portion (joint receiving portion) 18 is detachably provided at the center portion of the hitch frame 16 in the left-right direction.

The connecting portion 4 includes a front arm mounting member 21 rotatably attached to the hitch frame 16 of the mounting portion 2, two rotatable connecting arms (parallel links) 22 located parallel to each other, and a working portion. It has a rear arm mounting member 23 rotatably mounted on the support shaft 9 of 3.

The front end of each connecting arm 22 is rotatably attached to the front arm mounting member 21 via a fulcrum pin 24 in the vertical direction, and the rear end of each connecting arm 22 is attached to the rear arm mounting member 23. It is rotatably attached via a fulcrum pin 25 in the vertical direction. The rear arm mounting member 23 has a cylindrical bearing portion 26 extending in the front-rear direction, and the support shaft 9 of the working portion 3 is rotatably held by the bearing portion 26.

The work unit 3 includes a work means 5 that performs mowing work (agricultural work) while rotating in a predetermined direction, a cover 31 that covers the work means 5, and a pulley case 32 attached to the left side of the cover 31. It has a gear case 33 attached to the pulley case 32.

The work means 5 has a left-right rotation shaft 35 rotatably held by the side portions on both sides of the cover 31, and a grass cutting claw 36 which is a plurality of work claws attached to the rotation shaft 35. ..

Further, the intermediate input shaft 38 is rotatably held by the gear case 33, and the rear end portion of the power transmission means 11 is detachably attached to the intermediate input shaft 38. The power input from the power transmission means 11 to the intermediate input shaft 38 is, for example, a transmission means including the intermediate input shaft 38, the bevel gear in the gear case 33, the pulley in the pulley case 32, the belt, and the like (not shown). Is transmitted to the rotating shaft 35 of the working means 5.

The power transmission means 11 receives the power from the PTO shaft side of the tractor by the input shaft (first input shaft) 40 at the front end and transmits the power to the intermediate input shaft (second input shaft) 38 on the rear side. It is a power transmission shaft body (wide-angle joint) that is detachably connected (connected) between a joint (not shown) connected to the PTO shaft of the tractor and the intermediate input shaft 38.

Specifically, the power transmission means 11 has a shaft-shaped rotary shaft body 41 for power transmission that can be bent at two locations on both ends in the axial direction, and a non-rotatable tubular shape that covers the outer peripheral side of the rotary shaft body 41. It has a safety cover body 42, which is a cover portion of the above. The safety cover body 42 cannot rotate because it is connected to the cover device 12 by using, for example, a chain for preventing rotation (not shown).

The rotating shaft body 41 has a straight and linear telescopic shaft portion 45 that can be expanded and contracted in the axial direction, and bendable bent portions (folded portions) 46 and 47 provided at both ends of the telescopic shaft portion 45 in the axial direction, respectively. And an input shaft 40 which is an input portion provided in the bending portion 46 on the front side of the plurality of bending portions 46 and 47. The input shaft 40 constituting the front end portion of the rotating shaft body 41 is rotatably held by the input shaft holding portion 18 of the mounting portion 3. The input shaft 40 can be attached to and detached from the hitch frame 16 together with the input shaft holding portion 18.

The telescopic shaft portion 45 has an inner shaft 48 and an outer shaft 49 that is slidable with respect to the outer peripheral surface of the inner shaft 48. The front bent portion 46 includes a front yoke 51, an intermediate yoke (wide-angle yoke) 52, a rear yoke 53, a cross-shaped front spider 54 connecting the two yokes 51 and 52, and two yokes. It has a cross-shaped posterior spider 55 that connects 52 and 53 (see Fig. 4). The rear end of the input shaft 40 is fixed to the front yoke 51. The front end portion of the inner shaft 48 is fixed to the rear yoke 53.

The rear bent portion 47, like the front bent portion 46, has a cross-shaped front side connecting the front yoke 56, the intermediate yoke (wide-angle yoke) 57, the posterior yoke 58, and the two yokes 56, 57. It has a spider 59 and a cross-shaped posterior spider 60 that connects the two yokes 57 and 58. The rear end portion of the outer shaft 49 is fixed to the front yoke 56. The rear yoke 58 is detachably attached to the front end of the intermediate input shaft 38. The bent portion 47 on the rear side is covered with a cover means 13 having a rubber cover plate 14 bent in a U shape.

The safety cover body 42 has an elongated tubular front cover member 61 and an elongated tubular rear cover member 62 that is slidable with respect to the outer peripheral surface of the front cover member 61. The front cover member 61 has a conical diameter-expanding cover portion 64 at the front end portion that gradually expands in diameter toward the front opening 63 side, which is the front end side, and the diameter-expanding cover portion 64 and the cover device. The bent portion 46 on the front side is covered with 12. Further, the rear side cover member 62 has a conical diameter-expanding cover portion 66 at the rear end portion that gradually expands in diameter toward the rear surface opening 65 side, which is the rear end side, and the diameter-expanding cover portion 66 And the covering means 13 cover the rear bent portion 47.

As shown in FIGS. 4 to 8, the cover device 12 includes a short tubular outer cover body 71 that covers the outer peripheral side of the bent portion 46 on the front side of the rotating shaft body 41 of the power transmission means 11, and the outer cover body. The outer cover body 71 is rotatably provided around the rotation center axis (rotation fulcrum) X in the vertical direction so as to be located inside the outer cover body 71, and covers the outer peripheral side of the bent portion 46 together with the outer cover body 71. It is equipped with a short tubular inner cover body 72.

That is, in this cover device 12, the outer cover body 71 fixedly attached to the center portion in the left-right direction of the hitch frame 16 of the mounting portion 2 is provided with the enlarged cover portion 64 at the front end portion of the safety cover body 42. The inner cover body 72 that is pressed and rotates (pushes) around the rotation center axis X so as to follow the bending operation of the bending portion 46 is provided.

The rotation center axis X of the inner cover body 72 is located between the two front and rear spiders 54 and 55 of the bent portion 46, and overlaps with the intermediate yoke 52 in a plan view. Further, in a state where the bent portion 46 is not bent as shown in FIG. 5, the rotation center axis (rotation center) X is a center point A of the front spider 54 and a center point B of the rear spider 55 in a plan view. It is located in the center of the connected line segment L. The position of the rotation center axis X is most preferably the illustrated example, but it may be a position slightly deviated from the center of the line segment L.

Further, the cover device 12 includes a stopper means 73 that regulates the rotation of the inner cover body 72 with respect to the outer cover body 71 within a predetermined range so that the inner cover body 72 does not rotate more than necessary. The predetermined range (rotation angle range) is preferably within about 30 degrees, for example.

As shown in FIG. 7, the outer cover body 71 is formed by, for example, an upper outer cover member 76 and a lower outer cover member 77 attached to the upper outer cover member 76 by a fixture 78, and has an open front and rear surface and a shaft. It is configured in an octagonal cylinder shape with a short directional length. The fixture 78 is, for example, a bolt 79 and a nut 80. The upper and lower cover members 76 and 77 are made of metal, for example.

The upper and outer cover members 76 have a left-right pair of mounting plate portions 81 on the front side, and a welding nut 82 is fixed to the mounting plate portions 81. Then, by screwing the wing bolt 83 into the welding nut 82, the mounting plate portion 81 is attached to the mounted portion 84 of the hitch frame 16.

Further, the upper / outer cover member 76 has a left-right pair of front plate portions (front guards) 85 that cover the front side of the bent portion 46. Further, the upper outer cover member 76 has an upper plate portion 86, and an upper mounting hole 87 is formed in the upper plate portion 86. The upper / outer cover member 76 is formed with a chain hole 88 for hooking a chain for preventing rotation (not shown).

The lower outer cover member 77 has a lower plate portion 91, and the lower plate portion 91 is formed with a lower mounting hole 92 that is separated from and opposed to the upper mounting hole 87. Further, the lower plate portion 91 is formed with an arc-shaped elongated hole 93 for restricting rotation centered on the lower mounting hole 92.

As shown in FIG. 8, the inner cover body 72 is formed by, for example, an upper inner cover member 96 and a lower inner cover member 97 attached to the upper inner cover member 96 by a fixture 98, and the front and rear surfaces are open and a shaft. It is configured in an octagonal cylinder shape with a short directional length. The fixture 98 is, for example, a bolt 99 and a nut 100. The upper and lower cover members 96 and 97 are made of metal, for example.

The upper inner cover member 96 has a left-right pair of plate-shaped contact portions 101 on the rear side that come into contact (contact) with the enlarged diameter cover portion 64 of the safety cover body 42 when the bent portion 46 is bent. .. That is, the power transmission means 11 has a diameter-expanded cover portion 64 that is a covering portion that covers the bent portion 46, and the inner cover body 72 has a protruding contact portion 101 that contacts the diameter-expanded cover portion 64. doing.

The contact portion 101 includes a first protruding plate 103 that protrudes diagonally inward from the rear end of the side plate portion 102 of the inner cover body 72, and a second protruding plate 103 that projects diagonally backward and outward from the rear end of the first protruding plate 103. It is composed of a protruding plate 104. The bent plate-shaped contact portion 101 is positioned so as to project rearward from the rear opening 71a of the outer cover body 71 (see FIG. 5). Further, the upper inner cover member 96 has an upper plate portion 106, and an upper mounting hole 107 is formed in the upper plate portion 106.

The lower inner cover member 97 has a lower plate portion 108, and the lower plate portion 108 is formed with a lower mounting hole 109 that is separated from and opposed to the upper mounting hole 107. Further, a pin 110 for restricting rotation inserted into the elongated hole 93 is fixed to the lower plate portion 108. The elongated holes 93 and the pins 110 constitute the stopper means 73, which is a rotation restricting means.

Here, as shown in FIG. 6, the inner cover body 72 is rotatably attached to the outer cover body 71 by the upper and lower mounting means 111. The mounting means 111 is, for example, a bolt 112, a nut 113, a washer 114, and a collar 115.

Then, the shaft portion 112a of the bolt 112 of the upper mounting means 111 is inserted into the upper mounting holes 87 and 107 via the collar 115, and the shaft portion 112a of the bolt 112 of the lower mounting means 111 is lowered via the collar 115. By being inserted into the side mounting holes 92 and 109 and the pin 110 of the inner cover body 72 being inserted into the elongated hole 93 of the outer cover body 71, the inner cover body 72 is bolted up and down with respect to the outer cover body 71. It can rotate within a predetermined range around the shaft portion 112a of 112. The rotation center axis X of the inner cover body 72 is a straight line passing through the axis of the shaft portion 112a of the upper and lower bolts 112.

Further, the expanded cover portion 64 of the safety cover body 42 is inserted into the inner cover body 72 from the rear side, and the inserted enlarged diameter cover portion 64 and the upper and lower plate portions 106 of the inner cover body 72, Since there is a predetermined gap between the cover and the 108, even if the bent portion 46 bends in the vertical direction, the expanded cover portion 64 of the safety cover body 42 does not interfere with the inner cover body 72, only in the horizontal direction. It can also handle vertical folds.

In the example shown in FIG. 6, the upper and lower mounting means 111 are used. For example, the inner cover body 72 is rotatably attached to the outer cover body 71 by only one of the upper and lower mounting means 111. You may do it.

Next, the operation and the like of the agricultural work machine 1 will be described.

When the agricultural work machine 1 is attached to the rear part of the tractor and the tractor is moved forward in the traveling direction by traveling, the work means 5 of the work unit 3 performs the mowing work while rotating in a predetermined direction in a desired work state.

At this time, the power from the PTO axis of the tractor is sequentially transmitted to the rotating shaft 35 of the working means 5 via the joint, the power transmitting means 11, and the transmitting means, and as a result, the mowing claw 36 rotates in a predetermined direction together with the rotating shaft 35. And mow the grass.

Here, for example, when the stored state shown in FIG. 2 is switched to the offset state shown in FIG. 3, the inner cover body 72 of the cover device 12 becomes the enlarged cover portion 64 of the safety cover body 42 of the power transmission means 11. It is pressed and rotates about the rotation center axis X so as to follow the bending motion (folding in the horizontal direction) of the bending portion 46, and as a result, the axial direction is inclined with respect to the front-rear direction in a plan view. It becomes.

That is, the inner cover body 72 rotates with respect to the outer cover body 71 by pushing the contact portion 101 on the right side sideways by the enlarged cover portion 64 of the safety cover body 42 based on the bending motion of the bending portion 46. Then, the rear opening 72a is in a state of facing diagonally backward.

Therefore, even in the offset state shown in FIG. 3, that is, the bent portion 46 on the front side of the power transmission means 11 is bent in the horizontal direction with a relatively large bending angle (for example, 50 degrees), one of the bent portions 46. Since there is no gap to expose the part (mainly the intermediate yoke 52, which is a wide-angle yoke) to the rear side, and the entire bent part 46 is covered, the bent part 46, which is a rotating part that rotates during power transmission, is It is invisible to the eye, and for example, foreign matter is prevented from being caught.

Therefore, according to such an agricultural work machine 1, since the cover device 12 including the outer cover body 71 and the inner cover body 72 rotatable with respect to the outer cover body 71 is provided, for example, for some reason. Even if the intermediate yoke 52 or the like of the bent portion 46 on the front side of the power transmitting means 11 is damaged, the fragments do not scatter around, and foreign matter can be prevented from being caught by the bent portion 46, thereby improving safety. And further safety can be ensured.

Further, the inner cover body 72 rotates with respect to the outer cover body 71 so as to follow the bending motion of the bending portion 46 by contact (contact) between the contact portion 101 and the enlarged cover portion 64 of the safety cover body 42. Since the bending operation is interlocked with the bending operation about the central axis X, the bending portion 46 can be appropriately covered by the inner cover body 72, and the safety can be further improved.

Further, since the cover device 12 includes the stopper means 73 that regulates the rotation of the inner cover body 72 with respect to the outer cover body 71 within a predetermined range, it is possible to appropriately prevent the inner cover body 72 from rotating more than necessary. ..

The inner cover body 72 of the cover device 12 is not limited to the one in which the upper and lower cover members 96 and 97 are assembled to form a short-angle cylinder as shown in FIG. 8, and the diameter is expanded as shown in FIG. 9, for example. A single plate-shaped member 117 having two hollow contact portions 116 having a D-shaped cross section in contact with the cover portion 64 may be formed into a short cylinder shape.

The inner cover body 72 shown in FIG. 9 is rotatably attached to the outer cover body 71 only by the upper mounting means 111. The plate-shaped member 117 is, for example, a resin plate, a rubber plate, a metal plate, or the like. The contact portion 116 is made of an elastic material such as elastically deformable rubber. For example, an elastic plate such as a rubber plate may be attached to the surface of the contact portion 116 of the inner cover body 72 shown in FIG. 8, or the contact portion 116 may be formed of the elastic plate.

Further, for example, by providing the cover device 12 instead of the cover means 13, the two front and rear bent portions 46 and 47 of the power transmission means 11 may be covered by the two front and rear cover devices 12 and 12, respectively.

Further, the stopper means 73 of the cover device 12 is not limited to the one including the elongated hole 93 and the pin 110 for restricting rotation, and for example, the rotation is restricted by an urging member such as a pull spring that urges the inner cover body. Or, the rotation is restricted by the contact between the inner cover body and the outer cover body. It should be noted that the stopper means is not always necessary, and a configuration in which the stopper means is not provided may be used.

Further, the agricultural work machine using the cover device is not limited to the grass mower, and can be applied to the agricultural work machine provided with a power transmission means such as a wide-angle joint having a bent portion that bends relatively greatly, for example, a ridge coating machine and a grooving machine. It may be a machine, a sprayer, etc., and can also be applied to work machines other than agricultural work machines.

1 Agricultural work machine that is a work machine 5 Work means
11 Power transmission means
12 Cover device
46 Bending part
54, 55 Spider
71 Outer cover body
72 Inner cover body
73 Stopper means
101,116 Contact part X Rotation center axis

Claims (6)

A cover device that covers the bent portion of the power transmission means used in the work machine.
An outer cover body that covers the bent portion and
A cover device that is rotatable with respect to the outer cover body and includes an inner cover body that covers the bent portion. The cover device according to claim 1, wherein the inner cover body rotates so as to follow a bending motion of the bending portion of the power transmission means. The cover device according to claim 1 or 2, wherein the inner cover body has a contact portion that comes into contact with the power transmission means. The cover device according to any one of claims 1 to 3, further comprising a stopper means for restricting the rotation of the inner cover body with respect to the outer cover body. The bend of the power transmission means has two spiders
The cover device according to any one of claims 1 to 4, wherein the inner cover body rotates about a rotation center axis located between the two spiders. Work means and
A power transmission means for transmitting power for driving the work means and
A working machine comprising the cover device according to any one of claims 1 to 5, which covers a bent portion of the power transmission means.

Images